178 _-MR. NUTTALL’S DESCRIPTIONS OF NEW 
A slender biennial, with a fusiform, simple root, about eight to ten inches high. 
Radical leaves very hairy, pinnatifid, attenuated with slender petioles, little more 
than an inch long. Branchlets rather long and slender, often forked; each of the 
slender branchlets one-flowered ; stem leaves linear, very elegantly ciliated, by white - 
pellucid bristles about a line long. Heads hemispherical; the scales of the 
involucrum in about three series, acute, rays fifteen or sixteen, with a much shorter 
and less copious. pappus than the discal florets. Discal florets narrow and cylindric, 
with very small teeth. Stigmas pubescent, lanceolate, with filiform terminations. 
Pappus bright brown, by transmitted light orange or flame red, in two series, or of 
two kinds, some of the scabrous bristles being two or three times as thick as the 
others, which are shorter, and appear to be an outer series. The receptacle is covered 
with rather long white acuminate palea. Achenium obovate, compressed, at first 
multistriate ; at length the ribs are hidden with a silky villous. 
Has. Near Santa Fé, (New Mexico.) Flowering in August. 
MICROPUS. 
M. *HETEROPHYLLUS. Annual, erect, simple, slender ; densely lanuginous above, tomentose below; leaves 
below linear. acute, above lanceolate, obtuse and sessile; capituli lateral and terminal, more densely 
lanuginous ; discal florets about five, masculine three to five. 
Very nearly alljed to IL angustifolius, but the heads appear larger and more 
wooly, and the upper leaves are different. 
- Has. Santa Barbara, Upper California. 
POLYPAPPUS. 
P, *sericeus. Shrubby; younger branches and leaves sericeous; branches very leafy, ending in sma!l _ 
corymbose clusters of flowers; leaves lanceolate-linear, one-nerved, entire, acute, at length nearly 
smooth ; achenia smooth. 
A rather large shrub, the branches striate and terete, rather whitely pubescent. 
Leaves alternate, one to one and a half inches long, one to two lines wide, crowded 
together so as to hide the stem. Involucrum small, tomentose, campanulate, the 
scales ovate in several series, the inner lacerate on the margin. Flowers (in the onl y 
imperfect specimen I have seen,) apparently male. Receptacle flat and naked. 
Rudimental achenia smooth and subcylindric, with five striae, and terminated by a 
pappus of about ten rather unequal thickly clavellated hairs. Bitter and astringent 
to the taste. 
Has. Rocky Mountains of Upper California. 
